Gunsmithing FSB in Bushy piston ?

jbgleason

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Nov 3, 2010
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Does anyone know if the FSB/gas block in the BushMaster piston uppers is the same as in DI uppers? Or is it proprietary to the design?

I have a piston upper, never fired, and I want to convert from the fixed front to a low profile so I can put an extended railed hand guard on it that extends over the gas block.

Thanks in advance.